Объяснение:
Mr(K2O) = 39*2+16 = 94
W(K) = Ar(K) *n / Mr(K2O) *100% = 39*2 / 94 *100% =83%
W(O) = Ar(O) *n / Mr(K2O) *100% = 16*1/94 *100% =17%
Mr(K2S) = 39*2 + 32 = 110
W(K) = Ar(K) *n / Mr(K2S) *100% = 39*2 / 110 *100% = 71%
W(S) = Ar(S) *n / Mr(K2S) *100% = 32*1 / 110 *100% = 19%
